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Assessment of SSI interaction effects for deep diaphragm walls and adjacent buildings considering spatial variability of parameters, post-peak behavior and concrete cracking
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2021-07-23 , DOI: 10.1016/j.tust.2021.104112
Emilios M. Comodromos 1
Affiliation  

Recent research works into the design and response evaluation of deep diaphragm walls and induced settlements to adjacent buildings demonstrated that the nonlinear behavior of surrounding soil, cracking effects affecting the structural members’ flexural rigidity and spatial variability of soil parameters are a prerequisite for a rigorous analysis of serviceability performance. However, as a result of the complexity of the mechanisms developed in the case of deep multi-propped retaining structures, most of the proposed Soil Structure Interaction (SSI) design methodologies are biased towards geotechnical or structural behavior by adequately capturing the nonlinearities of the one field and considering a rather simplified behavior of the other. With the aim to bridge the gap between the above design methodologies, a fully coupled analysis of a multi-propped diaphragm wall of an underground station with a supporting grout slab at the excavation bottom has been carried out. Further to the nonlinear behavior of the soil, the spatial variability of the grout treated zone strength and stiffness together with the post-peak behavior have been considered. In addition, the concrete cracking effects, associated with substantial decrease of structural members’ stiffness, have been taken into account. Comparative simplified empirical approaches disregarding cracking effects by adopting constant diaphragm wall flexural rigidity instead, have been carried out as well. Interesting conclusions were drawn relating the results of the above simplified approaches and the Serviceability Limit State (SLS) analyses with regard to the response of the diaphragm wall, the bending moment distribution along the wall and the displacement field in the surrounding soil and adjacent buildings.



中文翻译:

考虑参数、峰值后行为和混凝土开裂的空间变异性评估深连续墙和相邻建筑物的 SSI 相互作用效应

最近对深连续墙的设计和响应评估以及相邻建筑物引起的沉降的研究表明,周围土壤的非线性行为、影响结构构件抗弯刚度的开裂效应和土壤参数的空间可变性是进行严格分析的先决条件服务性能。然而,由于在深多支撑挡土结构的情况下开发的机制的复杂性,大多数提出的土壤结构相互作用(SSI)设计方法通过充分捕捉一个的非线性而偏向于岩土或结构行为。领域并考虑另一个相当简化的行为。为了弥合上述设计方法之间的差距,已经对地下车站的多支撑连续墙在开挖底部带有支撑灌浆板进行了全耦合分析。除了土壤的非线性行为之外,还考虑了灌浆处理区强度和刚度以及峰值后行为的空间变异性。此外,还考虑了与结构构件刚度显着降低相关的混凝土开裂效应。通过采用恒定的连续墙抗弯刚度来代替开裂效应的比较简化的经验方法也已经实施。将上述简化方法的结果和适用性极限状态 (SLS) 分析的结果与连续墙的响应相关联,得出了有趣的结论,

更新日期:2021-07-23
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